Why these prices change 2010 cards trade on relative supply: PSA pop reports, sealed-product scarcity, character popularity (especially Eeveelutions, starters, and legendary Pokmon), and grading-grade availability
Presumably the fact that the Sivitri story was called "The Dragon War", which is also the term Jeff Lee uses for the Elder Dragon War, caused some confusion
You might snag either cards you dont own or duplicates, but luckily you can trade several duplicates in for some cool cosmetic effects, so they arent wasted
it gains 700 ATK until the end of this turn (even if this card leaves the field)

Abandon the Post Ancient Grudge Backdraft Hellkite Bash to Bits Blast from the Past Bulk Up Burning Oil Calibrated Blast Call the Mountain Chocobo Conflagrate Desperate Ravings Devil's Play Duel Tactics Earth Rift Electric Revelation Electroduplicate Engulfing Flames Faithless Looting Fire Nation Attacks Firebolt Firecat Blitz Fires of Undeath Flaming Gambit Flaring Pain Flash of Defiance Flashback Geistflame Ignite the Future Increasing Vengeance Isengard Unleashed Kaleidoscorch Kindle the Inner Flame Laughing Mad Lava Dart Light Up the Night Lightning Surge Lost in Memories Nibelheim Aflame Nightbird's Clutches Past in Flames Prisoner's Dilemma Random Encounter Reckless Charge Recoup Return the Past Rolling Temblor Scorching Missile Seize the Day Seize the Storm Shattered Perception Snort Solstice Revelations Sorceress's Schemes Strike It Rich Tome Blast Visions of Ruin Volcanic Spray Volley of Boulders Will of the Jeskai

An excellent finisher that turns your opponents greatest deceased threats against them